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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ee89038b1df9f069fcbd6768d8363357bd56b3b69b064ae9e2ffa9bad7a563' 
  AND token = 'evuEC8S08I+2YIHffbe4D6i0NzZDPcVClnkHJcmWAk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}